Transmission of sounding reference signals for adaptively configured TDD communication systems
First Claim
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1. A method comprising:
- transmitting, by a base station to a User Equipment (UE) signaling indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index;
a control channel conveying a DL Control Information (DCI) format indicating a second TDD UL-DL configuration; and
first configuration information for the UE to periodically transmit a first Sounding Reference Signal (SRS) in a first UL SF of the first TDD UL-DL configuration using a first set of SRS transmission parameters,wherein the signaling indicating the first TDD UL-DL configuration, the DCI format indicating the second TDD UL-DL configuration, and the first configuration information, are configured to cause the UE to;
transmit the first SRS when the first UL SF is an UL SF in the second TDD UL-DL configuration, andsuspend transmission of the first SRS when the first UL SF is a DL SF in the second TDD UL-DL configuration.
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Abstract
Methods and apparatus of a base station or a User Equipment (UE) in communication with each other are provided. The UE is configured by the base station for operation with an adapted Time Division Duplex (TDD) UpLink-DownLink (UL-DL) configuration. A process enabling transmission of a Sounding Reference Signal (SRS) from the UE to the base station and a process for the base station to determine parameters for a DL transmission to the UE are provided.
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Citations
19 Claims
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1. A method comprising:
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transmitting, by a base station to a User Equipment (UE) signaling indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index; a control channel conveying a DL Control Information (DCI) format indicating a second TDD UL-DL configuration; and first configuration information for the UE to periodically transmit a first Sounding Reference Signal (SRS) in a first UL SF of the first TDD UL-DL configuration using a first set of SRS transmission parameters, wherein the signaling indicating the first TDD UL-DL configuration, the DCI format indicating the second TDD UL-DL configuration, and the first configuration information, are configured to cause the UE to; transmit the first SRS when the first UL SF is an UL SF in the second TDD UL-DL configuration, and suspend transmission of the first SRS when the first UL SF is a DL SF in the second TDD UL-DL configuration. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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transmitting, by a base station to a User Equipment (UE);
signaling indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index;a control channel conveying a DL Control Information (DCI) format indicating a second TDD UL-DL configuration; and configuration information for the UE to periodically transmit a first Sounding Reference Signal (SRS) in a first UL SF of the first TDD UL-DL configuration using a first set of SRS transmission parameters, wherein in response receiving the signaling indicating the first TDD UL-DL configuration and the configuration information, the UE transmits the first SRS when the UE determines that the first UL SF is an UL SF in the second TDD UL-DL configuration and suspending transmission by the UE of the first SRS when the UE is unable to determine that the first UL SF is an UL SF in the second TDD UL-DL configuration. - View Dependent Claims (7)
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8. A method comprising:
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transmitting, by a base station to a User Equipment (UE); information indicating a first Time Division Duplexing (TDD) Uplink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index; configuration information for the UE to transmit a Sounding Reference Signal (SRS) in an UL SF or a special SF of the first TDD UL-DL configuration, wherein in response to receiving the information indicating the first TDD UL-DL configuration, and the configuration information, the UE transmits the SRS in the UL SF or in the special SF; receiving, by the base station, the SRS in the UL SF or the special SF; and determining, by the base station based on the received SRS, parameters for a DL transmission to the UE in a first set of DL SFs wherein at least one DL SF in the first set of DL SFs is an UL SF in a second TDD UL-DL configuration and the UL SF or the special SF is an UL SF in the second TDD UL-DL configuration. - View Dependent Claims (9)
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10. A method comprising:
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transmitting, by a base station to a User Equipment (UE); information indicating a first Time Division Duplexing (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from the base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index; and configuration information for the UE to transmit a Sounding Reference Signal (SRS) in an UL SF or a special SF of the first TDD UL-DL configuration, wherein in response to receiving the information indicating the first TDD UL-DL configuration and the configuration information, the UE transmits the SRS in the UL SF or in the special SF; receiving, by the base station, the SRS in the UL SF or in the special SF; and determining, by the base station based on the received SRS, parameters of a DL transmission to the UE in a first set of DL SFs wherein at least one DL SF in the first set of DL SFs is a DL SF in a second TDD UL-DL configuration and the UL SF or the special SF is a DL SF in the second TDD UL-DL configuration. - View Dependent Claims (11)
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12. A User Equipment (UE) comprising:
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a receiver configured to receive; signaling indicating a first Time Division duplex (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from a base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index; a DCI format indicating the second TDD UL-DL configuration; configuration information to periodically transmit a first Sounding Reference Signal (SRS) in a first UL SF of the first TDD UL-DL configuration using a first set of SRS transmission parameters; and a transmitter configured to transmit the first SRS when the first UL SF is an UL SF in the second TDD UL-DL configuration and suspend transmission of the first SRS when the first UL SF is a DL SF in the second TDD UL-DL configuration. - View Dependent Claims (13, 14, 15, 16)
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17. A User Equipment (UE) comprising:
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a receiver configured to receive; signaling indicating a first Time Division duplex (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from a base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index; a control channel conveying a DL Control Information (DCI) format indicating a second TDD UL-DL configuration; configuration information to periodically transmit a first Sounding Reference Signal (SRS) in a first UL SF of the first TDD UL-DL configuration using a first set of SRS transmission parameters; and a transmitter configured to transmit the first SRS when the UE determines that the first UL SF is an UL SF in the second TDD UL-DL configuration, and to suspend transmission of the first SRS when the UE is unable to determine that the first UL SF is an UL SF in the second TDD UL-DL configuration, wherein the UE is configured to determine that the first SF is an UL subframe in the second TDD UL-DL configuration when it successfully receives the DCI format.
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18. A base station comprising:
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a transmitter configured to; transmit a signaling indicating a first Time Division duplex (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from a base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index; transmit configuration information for a Sounding Reference Signal (SRS) transmission from the UE in an UL SF or a special SF of the first TDD UL-DL configuration; a receiver configured to receive the SRS transmission from the UE in the UL SF or the special SF; and a processor configured to determine, based on the received SRS, parameters for a DL transmission to the UE in a first set of DL SFs wherein at least one DL SF in the first set of DL SFs is an UL SF in a second TDD UL-DL configuration and the UL SF or the special SF is an UL SF in the second TDD UL-DL configuration.
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19. A base station comprising:
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a transmitter configured to; transmit a signaling indicating a first Time Division duplex (TDD) UpLink-DownLink (UL-DL) configuration, wherein a TDD UL-DL configuration is defined over a time period of ten SubFrames (SFs) that comprise DL SFs where a communication direction is from a base station to the UE, UL SFs where a communication direction is from the UE to the base station, and special SFs where a communication direction is either from the base station to the UE and from the UE to the base station or both, and wherein each SF of the ten SFs has a unique time domain index; transmit configuration information for a Sounding Reference Signal (SRS) transmission from the UE in an UL SF or a special SF of the first TDD UL-DL configuration; a receiver configured to receive the SRS transmission from the UE in the UL SF or the special SF; and a processor configured to determine, based on the received SRS, parameters for a DL transmission to the UE in a first set of DL SFs wherein at least one DL SF in the first set of DL SFs is a DL SF in a second TDD UL-DL configuration and the UL SF or the special SF is a DL SF in the second TDD UL-DL configuration.
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Specification